Engineering Low pass filter circuit questions

AI Thread Summary
A low pass active filter relies on a capacitor to provide frequency-dependent behavior; without it, the circuit behaves like a non-inverting amplifier with constant gain. The absence of the capacitor means no filtering occurs, as the circuit lacks the necessary components to attenuate higher frequencies. As frequency increases, the gain of the circuit remains constant until the op-amp's bandwidth limits are reached, leading to eventual roll-off. This roll-off can be determined by analyzing the op-amp's gain-bandwidth product and the circuit's configuration. Understanding these concepts is crucial for effectively designing and analyzing low pass filter circuits.
thenerveman
Messages
1
Reaction score
0

Homework Statement



Why does a low pass active filter give a constant gain and no filtering when the capacitor is removed? What type of circuit does this become? Support your answer with equations.

also

Does the amplitude eventually roll off as the frequency was increased toward to a very large value? how would you determine this value? Why does this occur?

Homework Equations



not sure


The Attempt at a Solution



i don't know where to start really. Our professor is a week behind in his lectures and he assigned this.. I am stuck on these two questoins.
 
Physics news on Phys.org
Search for a low pass filter constructed around an OP-AMP.
 
The capacitor is the frequency dependent component and, as nascent oxygen has indicated, an op amp has some frequency dependency
 

Similar threads

Engineering Is it possible for a low pass filter to have such a transfer function?
Replies
16
Views
2K
Engineering How to determine circuit components of ´Mystery Box’ ?
Replies
4
Views
1K
Engineering Frequency Response of High-Pass Filter at 1kHz
Replies
27
Views
3K
Second order low pass filter with unity gain
Replies
6
Views
3K
Cascaded low-pass filter followed by a buffer amplifier
Replies
11
Views
4K
Low pass filter (uniform/gauss distribution)
Replies
11
Views
4K
Finding R and C values for an active second-order bandpass filter
Replies
16
Views
3K
[Homework] Identify Filter type
Replies
4
Views
1K
Engineering How to tell if the circuit is a High or low pass filter?
Replies
9
Views
35K
Engineering Understanding the Gain and Bode Plot of a Low Pass Filter Circuit with C1 > C2
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top